SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule III Real Estate and Accumulated Depreciation

					Initial Cost to Company									Cost Amount Carried at Close of Period
Property	City	State	Encumbrances(1)		Land		Buildings and Improvements		Costs Capitalized Subsequent to Acquisition, Net		Impairment/Write Downs			Land		Buildings and Improvements		Total(2)		Accumulated Depreciation(3)		Date Acquired	Original Construction Date
1225 Seventeenth Street	Denver	CO	$	—	$	22,400	$	110,090	$	33,108	$	(2,750	)	$	22,400	$	140,448	$	162,848	$	35,066	6/24/2009	1982
1250 H Street, NW	Washington	DC	—		5,975		53,778		15,895		(579		)	5,975		69,094		75,069		33,383		6/23/1998	1992
Georgetown-Green and Harris Buildings	Washington	DC	—		24,000		35,979		1,076		—			24,000		37,055		61,055		8,402		9/3/2009	1960;1975
109 Brookline Avenue	Boston	MA	—		3,168		30,397		15,636		(1,397		)	3,168		44,636		47,804		21,853		9/28/1995	1915
1735 Market Street	Philadelphia	PA	—		24,753		222,775		95,918		(14,927		)	24,748		303,771		328,519		136,425		6/30/1998	1990
206 East 9th Street	Austin	TX	26,000		7,900		38,533		5,362		(444		)	7,900		43,451		51,351		7,073		5/31/2012	1984
Bridgepoint Square	Austin	TX	—		7,784		70,526		20,637		(1,172		)	7,784		89,991		97,775		45,146		12/5/1997	1986;1996;1997
Research Park	Austin	TX	—		15,859		60,175		33,383		—			21,212		88,205		109,417		38,117		10/7/1998; 10/11/2016	1968;1998; 2001
333 108th Avenue NE	Bellevue	WA	—		14,400		136,412		2,746		(31		)	14,400		139,127		153,527		33,117		11/12/2009	2008
600 108th Avenue NE	Bellevue	WA	—		3,555		30,244		19,677		(1,199		)	3,555		48,722		52,277		17,386		7/16/2004	1980
			$	26,000	$	129,794	$	788,909	$	243,438	$	(22,499	)	$	135,142	$	1,004,500	$	1,139,642	$	375,968

Analysis of the carrying amount of real estate properties and accumulated depreciation:

	Real Estate Properties			Accumulated Depreciation
Balance at January 1, 2016	$	3,887,352		$	898,939
Additions	113,258			101,647
Loss on asset impairment	(58,595		)	(119		)
Disposals	(1,085,125		)	(245,212		)
Balance at December 31, 2016	2,856,890			755,255
Additions	55,041			71,979
Loss on asset impairment	(6,711		)	—
Properties classified to held for sale	(138,130		)	(62,064		)
Disposals	(1,019,479		)	(314,452		)
Balance at December 31, 2017	1,747,611			450,718
Additions	58,618			39,161
Loss on asset impairment	(12,032		)	—
Disposals	(654,555		)	(113,911		)
Balance at December 31, 2018	$	1,139,642		$	375,968

(1) Excludes net unamortized premiums and net unamortized deferred financing costs.

(2) Excludes value of real estate intangibles. Aggregate cost for federal income tax purposes is approximately $1,129,227.

(3) Depreciation is calculated using the straight line method over estimated useful lives of up to 40 years for buildings and improvements and up to 12 years for personal property.